Gradient Four-Vector
The 4-dimensional version of the Gradient, encountered frequently in general relativity 
and special relativity, is
which can be written
where
is the d'Alembertian Operator.See also d'Alembertian Operator, Gradient, Tensor, Vector
References
Morse, P. M. and Feshbach, H. ``The Differential Operator 
.'' §1.4 in Methods of Theoretical Physics, Part I. New York: McGraw-Hill, pp. 31-44, 1953.
- Gaussian Elimination
- Gaussian Function
- Gaussian Hypergeometric Series
- Gaussian Integer
- Gaussian Integral
- Gaussian Integral (Linking Number)
- Gaussian Joint Variable Theorem
- Gaussian Mountain Range
- Gaussian Multivariate Distribution
- Gaussian Polynomial
- Gaussian Prime
- Gaussian Quadrature
- Gaussian Sum
- Gauss-Jacobi Mechanical Quadrature
- Gauss-Jordan Elimination
- Gauss-Kummer Series
- Gauss-Kuzmin-Wirsing Constant
- Gauss-Laguerre Quadrature
- Gauss-Manin Connection
- Gauss Map
- Gauss Measure
- Gauss Multiplication Formula
- Gauss Plane
- Gauss-Salamin Formula
- Gauss's Backward Formula